Filter-press



(No Model.)

A. GORDON.

Filter Pre No. 240,406. nted April 19,1881.

H :1 IN

I ""R N! N a 5% L- n m I m g is 2/ i N I Ni WITNESSES: J/Vi ENTOR VVIZMa/WV 92/ UNITED STATES PATENT OFFICE.

ALEXANDER GORDON, OF CINCINNATI, OHIO.

Fl LTER-PRESS.

SPECIFICATION forming part of Letters Patent No. 240,406, dated April 19, 1881.

Application filed March 5, 1881. (No model.)

To all whom it may concern Be it known that I, ALEXANDER GORDON, a subject of Great Britain, and a resident of Cincinnati, Hamilton county, Ohio, have invented certain new and useful Improvements in FilterPresses, of which the following is a specification.

This invention relates to the arrangement of passages and valvesin that class of filtering-presses in which the material to be filtered is forced into cells lined with cloth or other filtering material, the thin matter being forced through the cloth and the thick matter remaining in the cells in the form of slushy cakes. While the cells are full of thick matter a liquid is sometimes forced through the cakes in order to wash the filtrate or to extract some quality from it. When provided with means for executing this latter process the press is said to have an extracting attachment. The expressed liquid, or the extracting liquid, if volatile, should be carried from the press without ex-' posure. Means to this end are termed undercover attachments. Vhen the cells are full of matter it is desirable to cleanse them without opening the cells. This 'is done by steam or liquid actinginward from the outside of the cells.

The accompanying drawing is a horizontal section ofafilter-prcss embodying my improvements.

A is the head-plate, G O and D D cell-plates, and B the tail-plate, attached together, as usual, and forming between their adjacent faces the cells G, lined with filtering-webs E, having a general inlet, H, all as usual.

0 and N are outlets from the cells outside the filtering-webs. A substance forced into H fills the cells and the liquid port-ions pass through the webs and out of the outlets. The passage N, with which the outlets communicate, allows the liquid to be carried away under cover.

P P P are valves arranged to close every alternate outlet.

J is a passage, which, by means of passages K, is in communication with the cells in pairs, as shown. This passage is used in the process of extraction. It is to be fed with liquid under pressure. By the use of three-way cock I the inlet H may, if desired, be used for the extracting-liquid.

The process of extractionis as follows Cock I is set to close inlet H, valves P are closed, extracting-liquid is forced into J, enters all the cells on one side of the cakes of filtrate, passes through the filtrate and webs into the cells on the other side of the cakes, and out at the open outlets O and into the passage M.

To remove the filtrate by means of steam, the cook I is set to close H and J, the tailcock J is opened, the outlet-cock It is closed, the valves P opened, the cock Q is opened, and steam admitted. It enters all the cells, behind the cakes, passes through the webs and out at the tail-cock J, carrying the filtrate with it, and blowing the webs clean.

I claim as my invention 1. In filter-presses, the combination, with a passage arranged to admit extracting-liquid into the cells in pairs, as specified, of a passage communicating with all the cells, and having valves for closing communication between such passage and each alternate cell, substantially as specified.

2. In filter-presses, the combination, with an outlet-passage communicating with the cells inside the webs, of a steam-passage communicating with the cells outside the webs, substantially as specified.

3. In filter-presses, the combination,.with an inlet and outlet to the cells inside the webs, having valves or cooks for their control, of a passage communicating with the cells outside the webs and having an inlet for steam and an outlet for liquid, with cooks for controlling the same, substantially as specified.

ALEX. GORDON.

Witnesses J. W. SEE, GEO. T. Rnrss. 

